which of the following statements do you believe are true? in a normal distribution - a) approximately 70% of the values are within one standard deviation from the mean, b) twenty-seven percent of the values are between one and two standard deviations from the means. c) 2.1% of the values are between -2 and -3 standard deviations from the mean. d) .1% of the values are 3 of higher standard deviations from the mean. e) all the alternatives are correct. f) none of the alternatives are correct. g) only a and b are correct. h) only c and d are correct.